Woman assaulted after accepting lift

Police are looking for two men following an aggravated sexual assault in Sydney's west.

An 18-year-old woman was waiting for a bus in Blaxcell Street, Granville, about 7pm (AEST) on Friday, when two men in a dark blue sedan pulled up alongside her and offered her a lift, police said.

After initially declining the offer, the woman accepted and got into the back seat of the car and was allegedly driven to a location near Clyde Railway Station where she was sexually assaulted inside the sedan.

She was left at Clyde Railway Station where she contacted a friend before police were called.

She was taken to Westmead Hospital where she underwent an examination and was offered counselling.

Detectives have asked anyone with information or who noticed a dark blue sedan driving in Clyde, Granville or other nearby suburbs between 7pm and 8pm on Friday to call Crime Stoppers on 1800 333 000.